Here's a pretty good animation I came across which can be used to show
your non-techie friends and young kids what goes on when you push a key
into a cylinder lock and turn it.

http://www.wkrp.org/Lock

Jeff
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.